966 resultados para Mugil cephalus linnaeus
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"Actually published about Oct. 12, 1913. Copy sent to Stebben Elliott on tht dates; see Muhlenberg's letter of Nov. 7, 1813 to Elliott. Ed.M."--Note on end sheet of Arnold Arboretum copy.
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Dedication signed: John Berkenhout.
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Reprinted from: American Journal of Science & Arts. 1833. 25: 151-161.
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Mode of access: Internet.
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Hoffmann's work also has seperate t.p.: Die Angaben schinesischer und japanischer Naturgeschichten von dem illicium Religiosum : (dem Mangthsao der Schinesen, Sikiminoki der Japaner) und dem davon verschiedenen Sternanis des Handels.
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Reprinted from Tijdschrift voor natuurlijke geschiedenis en physiologie, 1836, iii, 115-142.
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Privately printed.
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The New York Statesman was printed by William A. Mercein, for Carter & Prentiss, editors and proprietors, in 1824.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Factors influencing the rate of cannibalism in juvenile blue-swimmer crabs Portunus pelagicus were investigated under controlled conditions using time-lapse video recordings. This study was undertaken to improve blue-swimmer crab culture and experimentally addressed (1) prey vulnerability (2) cannibal-victim interactions, and (3) activity patterns of juveniles in varying degrees of refuge. Crabs used in the study were aged 15 weeks and sorted into two size classes; small (less than or equal to 60 mm carapace width (CW)) and large (greater than or equal to65 mm CW) of a similar sex ratio. Vulnerability and thus survival was influenced by body size variation, moult stage and refuge availability. Crabs with carapace width less than or equal to 60 mm were more vulnerable than larger individuals, as indicated by significant differences in survival rates. As predicted, juveniles in transition stages associated with ecdysis were especially vulnerable. Premoult (redliner) crabs appeared to be in a high state of agitation as evidenced by the frequency of agonistic encounters and this may be a contributing factor to the high mortality observed at this critical premoult stag. increases in refuge density increased survival of juveniles proportionally, indicating that the quantity of shelter is important for reducing cannibalism in this species. Cannibal-victim interactions were frequently asymmetrical in terms of size and moult stage. Cannibals were significantly heavier than victims, and were predominantly at intermoult stage. Sexual biases among cannibals and victims were not found in this study. Activity patterns of juveniles were influenced by the experimental conditions. Crabs provided with high refuge showed reduced aggressive activity and increased time spent resting, but unchanged locomotion or feeding activity. Regular grading as well as the presence of suitable shelter for newly moulted crabs is recommended for improving culture of P. pelagicus. Research into inducing synchronous moulting may also yield promising results. (C) 2004 Elsevier B.V. All rights reserved.